CN113652533A - Slab heating control method and device - Google Patents
Slab heating control method and device Download PDFInfo
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- CN113652533A CN113652533A CN202110815717.1A CN202110815717A CN113652533A CN 113652533 A CN113652533 A CN 113652533A CN 202110815717 A CN202110815717 A CN 202110815717A CN 113652533 A CN113652533 A CN 113652533A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
Abstract
The invention relates to the technical field of hot rolling, in particular to a slab heating control method and device. The method comprises the following steps: in the first rolling period, controlling a heating furnace to heat the first slab sequence; controlling the second slab sequence to enter the inlet of the heating furnace at the beginning of the second roll period; the thickness of the second slab in the second slab sequence is smaller than that of the first slab in the first slab sequence; when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roll period; and closing the burners of the heating section corresponding to the foremost position of the first slab sequence in the heating furnace in sequence, and heating the second slab sequence by using the residual heat of the flue gas in the heating furnace. The invention realizes the mixed heating of the thin slab and the thick slab in the same heating furnace, reduces the heating furnace required in the hot rolling process, and thus reduces the production cost of the hot rolling process.
Description
Technical Field
The invention relates to the technical field of hot rolling, in particular to a slab heating control method and device.
Background
When the steel rabbet produces the strip steel, the heating operation of each heating section of the heating furnace is controlled according to the thickness of the plate blank, so that the tapping temperature of the plate blank is in a target temperature range. If the tapping temperature is too high, the energy consumption and the production cost of the heating furnace are increased, and the slab can be deformed in the furnace and even can not be discharged; if the tapping temperature is too low, the roller equipment can be damaged, and the subsequent steel rolling process is influenced. Therefore, when a steel enterprise produces strip steel with different thickness specifications, a plurality of hot rolling production lines are generally adopted to respectively heat slabs with different thickness specifications.
Therefore, how to reduce the production cost of the hot rolling process is a technical problem which needs to be solved at present.
Disclosure of Invention
The invention aims to provide a slab heating control method and a slab heating control device so as to reduce the production cost of a hot rolling process.
The embodiment of the invention provides the following scheme:
in a first aspect, an embodiment of the present invention provides a method for controlling slab heating, where the method includes:
in the first rolling period, controlling a heating furnace to heat the first slab sequence;
controlling a second slab sequence to enter an inlet of the heating furnace at the beginning of the second roll period; wherein the thickness of a second slab in the second slab sequence is less than the thickness of a first slab in the first slab sequence; when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roll period;
and closing burners of the heating section corresponding to the tail position of the first slab sequence in the heating furnace in sequence, and heating the second slab sequence by using the residual heat of the flue gas in the heating furnace.
In a possible embodiment, before the controlling the heating furnace to heat the first slab sequence, the method further comprises:
determining the production speed of the heating furnace according to a preset hot rolling production speed;
and determining the steel charging interval of the first slab sequence and the steel charging interval of the second slab sequence according to the production speed of the heating furnace.
In a possible embodiment, the thickness of the first slab is between 200 and 240 mm; the thickness of the second slab is 100 mm to 160 mm.
In a possible embodiment, before the controlling the heating furnace to heat the first slab sequence, the method further comprises:
determining the idle step length according to the tapping temperature of the first slab sequence;
if the highest tapping temperature of the first slabs with the set number at the tail of the first slab sequence is not more than 1160 ℃, the step length is 1.5-2.5 m; if the highest tapping temperature is 1160-1180 ℃, the idle step length is 3.5-4.5 meters; if the highest tapping temperature is 1180-1200 ℃, the idle step length is 5-6 meters; and if the highest tapping temperature is between 1200 and 1220 ℃, the idle step length is 7 to 8 meters.
In a possible embodiment, the steel-loading pitch of the second slab sequence ranges from 200mm to 300mm, so as to control the on-furnace time of the second slab in the heating furnace between 70 minutes and 150 minutes.
In a possible embodiment, the first slab has an overhang length on a water beam in the furnace of not more than 0.8 m, and the second slab has an overhang length on a water beam in the furnace of not more than 0.8 m.
In a second aspect, an embodiment of the present invention provides a device for controlling heating of a sheet blank, where the device includes:
the first control module is used for controlling the heating furnace to heat the first slab sequence in the first rolling period;
the second control module is used for controlling a second plate blank sequence to enter the inlet of the heating furnace when the second roll period starts; wherein the thickness of a second slab in the second slab sequence is less than the thickness of a first slab in the first slab sequence; when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roll period;
and the third control module is used for sequentially closing the burners of the heating section corresponding to the tail position of the first slab sequence in the heating furnace and heating the second slab sequence by using the residual heat of the flue gas in the heating furnace.
In a possible embodiment, the apparatus further comprises:
the first determining module is used for determining the production speed of the heating furnace according to the preset hot rolling production speed before the heating furnace is controlled to heat the first slab sequence;
and the second determining module is used for determining the steel charging interval of the first slab sequence and the steel charging interval of the second slab sequence according to the production speed of the heating furnace.
In a possible embodiment, the thickness of the first slab is between 200 and 240 mm; the thickness of the second slab is 100 mm to 160 mm.
In a possible embodiment, the apparatus further comprises:
the third determining module is used for determining the step length according to the tapping temperature of the first slab sequence before the heating furnace is controlled to heat the first slab sequence;
if the highest tapping temperature of the first slabs with the set number at the tail of the first slab sequence is not more than 1160 ℃, the step length is 1.5-2.5 m; if the highest tapping temperature is 1160-1180 ℃, the idle step length is 3.5-4.5 meters; if the highest tapping temperature is 1180-1200 ℃, the idle step length is 5-6 meters; and if the highest tapping temperature is between 1200 and 1220 ℃, the idle step length is 7 to 8 meters.
In a possible embodiment, the steel-loading pitch of the second slab sequence ranges from 200mm to 300mm, so as to control the on-furnace time of the second slab in the heating furnace between 70 minutes and 150 minutes.
In a possible embodiment, the first slab has an overhang length on a water beam in the furnace of not more than 0.8 m, and the second slab has an overhang length on a water beam in the furnace of not more than 0.8 m.
In a third aspect, an embodiment of the present invention provides a slab heating control apparatus, including:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the slab heating control method described in the first aspect.
In a fourth aspect, embodiments of the present invention provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, is configured to implement the steps of the slab heating control method described in the first aspect.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, the heating furnace is controlled to heat a thicker first slab sequence in a first roll period according to a conventional mode, then when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, a thinner second slab sequence is heated, and simultaneously along with the movement of the second slab sequence in the heating furnace, the burner of the heating section corresponding to the foremost position of the first slab sequence in the heating furnace is closed in sequence, and the second slab sequence is heated by utilizing the residual temperature of smoke in the heating furnace, so that the mixed heating of a thin slab and a thick slab in the same heating furnace is realized, the heating furnace required in a hot rolling process is reduced, and the production cost of the hot rolling process is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present specification, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a slab heating control method according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a heating furnace according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a slab heating control apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention belong to the scope of protection of the embodiments of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a slab heating control method according to an embodiment of the present invention, which specifically includes steps 11 to 13.
And 11, controlling the heating furnace to heat the first slab sequence in the first rolling period.
Specifically, as shown in fig. 2, a schematic structural diagram of a heating furnace according to an embodiment of the present invention is provided. The heating furnace is divided into four heating sections: the device comprises a preheating section, a first heating section, a second heating section and a soaking section. And a burner is arranged in each heating section and used for providing energy required by heating for each heating section. When the heating furnace works, the plate blank is placed on the water beam, and the plate blank is heated through each heating section in the heating furnace under the driving of the water beam. In a general heating furnace, the length of a heat recovery section is 6.5 to 23 meters, and the length of a preheating section is 5.5 to 9 meters; the length of the first heating section is 9-11 meters, the length of the second heating section is 8.5-10 meters, and the length of the soaking section is 8-10 meters.
Specifically, the first roll period is relative to the second roll period, and usually, one roll period corresponds to the production of strip steel with the same specification, and the heat treatment of the same process needs to be carried out on slabs with the same specification.
Specifically, the first slab sequence is a slab sequence in which one or more first slabs are arranged in sequence in the direction of the heating path in the heating furnace. In order to reduce the deformation influence of the gravity on the first slab, the difference between the length of the first slab and the farthest distance between the head and the tail of the water beam is not more than 1.6 meters in the embodiment, so that when the first slab is placed on the water beam, the length of the head and the length of the tail of the first slab, which are suspended out of the water beam, are both less than 0.8 meter. Here, the length of the first slab refers to its length in the direction of the heating path in the heating furnace.
And 12, controlling a second slab sequence to enter the inlet of the heating furnace at the beginning of the second roll period.
Wherein the thickness of a second slab in the second slab sequence is less than the thickness of a first slab in the first slab sequence; and when the distance from the end of the first slab sequence to the inlet of the heating furnace exceeds the blank step length, controlling the heating furnace to carry out heating in a second roll period.
Specifically, the thickness of the second slab is smaller than the thickness of the first slab, that is: the second slab is a thin slab and the first slab is a thick slab. Therefore, the tapping temperature of the first slab is higher than that of the second slab, and the heating temperature of the heating furnace for the first slab is also higher than that for the second slab.
If the temperature in the heating furnace is not controlled, the second slab is directly heated, which easily causes the deformation of the second slab. The temperature adjustment in the heating furnace has a certain hysteresis, and therefore, the embodiment hopes to reduce the influence of the heat for heating the first slab in the heating furnace on the second slab by pulling the distance between the first slab sequence and the second slab sequence.
Specifically, the second slab sequence should be kept at least a distance of the space length from the end of the first slab sequence when entering the entrance of the heating furnace, so as to realize the heating control of the second slab sequence.
Here, the inlet of the heating furnace means an inlet of a first heating stage (preheating stage) in the heating furnace. In order to reduce the deformation influence of the gravity on the second slab, the difference between the length of the second slab and the farthest distance between the head and the tail of the water beam is not more than 1.6 meters in the embodiment, so that when the second slab is placed on the water beam, the length of the head and the length of the tail of the second slab, which are suspended out of the water beam, are both less than 0.8 meter. Here, the length of the second slab refers to its length in the direction of the heating path in the heating furnace.
And step 13, closing burners of the heating section corresponding to the tail position of the first slab sequence in the heating furnace in sequence, and heating the second slab sequence by using the residual heat of the flue gas in the heating furnace.
Specifically, as the second slab sequence advances in the heating furnace, when the foremost position of the second slab sequence reaches the preheating section, all burners in the preheating section are closed in this embodiment; when the last position of the first slab sequence reaches the first heating section, all burners in the first heating section are closed; when the last position of the first slab sequence reaches the second heating section, all burners in the second heating section are closed; when the tail end position of the first slab sequence reaches the soaking section, all burners in the soaking section are closed; because the foremost end of second slab sequence has certain length apart from the end of first slab sequence, the flue gas waste heat in the heating furnace can be utilized to this embodiment, heat the second slab sequence, under the tapping temperature prerequisite of guaranteeing the second slab, reduce the influence of the heating of first slab to the second slab, the maximum efficiency utilizes the heating temperature of first slab, the hybrid heating of thin slab and thick slab in same heating furnace has been realized, required heating furnace in the hot rolling technology has been reduced, thereby the manufacturing cost of hot rolling technology has been reduced.
Specifically, if the tapping temperature of the second slab in any heating section is lower than the lower limit value of the temperature of the corresponding heating section, the burner in the corresponding heating section is turned on again, and the heating temperature of the corresponding heating section is increased; if the tapping temperature of the second plate blank in any heating section is greater than the upper limit value of the temperature of the corresponding heating section, introducing air into the corresponding heating section, and reducing the heating temperature in the heating section; if the second slab cannot be discharged due to a failure of the rolling mill or the like, the temperature of the second slab needs to be immediately reduced to 1000 ℃ or lower to prevent the slab from being deformed.
Since the tapping temperature of the slabs with small thickness difference is not greatly different, the heating temperature of the thicker slab does not cause heating deformation of the thinner slab, the embodiment is suitable for the continuous mixing heating process of the slabs with large thickness difference (but this does not mean that the embodiment is not suitable for the continuous mixing heating process of the slabs with small thickness difference), and the thickness specifications of the first slab and the second slab are provided.
In this embodiment, the thickness of the first slab is 200mm to 240mm, and the thickness of the second slab is 100 mm to 160 mm. The tapping temperature of the first slab of such a specification is usually 1250 degrees centigrade or more, and the tapping temperature of the second slab of such a specification is usually around 1100 degrees centigrade.
Specifically, the tapping temperature of the second slab at the outlet of the heating furnace can be 1100 +/-20 ℃, the end temperature of the second heating section is 950 +/-50 ℃, and the end temperature of the first heating section is 800 +/-100 ℃, so that the stable heating quality of the second slab can be ensured, the strength of the second slab in the furnace can be ensured, and the deformation can be prevented.
In the furnace shown in FIG. 2, the temperature of the preheating zone is controlled to be in the range of 800 ℃ to 1000 ℃, the temperature of one heating zone is controlled to be in the range of 900 ℃ to 1100 ℃, the temperature of the second heating zone is controlled to be in the range of 1000 ℃ to 1280 ℃, and the temperature of the soaking zone is controlled to be in the range of 1100 ℃ to 1250 ℃.
Here, the embodiment also provides a scheme of a steel loading interval of the first slab sequence and the second slab sequence, and specifically includes steps 21 to 22.
And step 21, determining the production speed of the heating furnace according to the preset hot rolling production speed.
In actual production, a plurality of heating furnaces are generally adopted to heat the plate blank in parallel, and steel is tapped from the same hot rolling production line, so that the production speed of each heating furnace is determined by the production speed of the hot rolling production line, and the production speed of the heating furnace is increased by the increase of the production speed of the hot rolling production line.
And step 22, determining the steel charging interval of the first slab sequence and the steel charging interval of the second slab sequence according to the production speed of the heating furnace.
Specifically, after the production speed of the heating furnace is known, the steel charging distance of the first slab sequence and the steel charging distance of the second slab sequence can be determined by combining the in-furnace time of the first slab and the second slab.
Here, the process of determining the charging pitch of the second slab sequence in the present embodiment will be described by taking parallel heating of 4 heating furnaces as an example.
In the art, the production speed can be expressed by tapping speed, and in the case of a constant tapping speed of a hot rolling line, the tapping speed of each heating furnace is reduced as the number of heating furnaces is increased, and the in-furnace time of a slab in each heating furnace is correspondingly prolonged.
In order to control the heating time of the second thin plate blank, two heating furnaces are selected to load steel for the last 40-60 plate blanks in the first plate blank sequence, the third heating furnace and the fourth heating furnace are not loaded with steel, the steel loading distance is controlled to be 200-300 mm, the time of the second plate blank in the furnace is controlled within the range of 70-150 min by controlling the production rhythm, the tapping temperature of the second plate blank is further ensured, and the overheating condition of the second plate blank is reduced.
In this embodiment, the length of the distance from the end of the first slab sequence to the foremost end of the second slab sequence directly affects the temperature in the furnace of the second slab sequence, and is important for heating the second slab sequence.
And 31, determining the step length according to the tapping temperature of the first slab sequence.
Specifically, in the same heat, the maximum tapping temperature of 15 first slabs at the end of the first roll period is used in the present embodiment to determine the length of the blank step between the second slab sequence and the last slab at the end of the previous roll period.
If the highest tapping temperature of 15 first plate blanks at the end of the first roll period is not more than 1160 ℃, the idle step length is 1.5-2.5 meters; if the highest tapping temperature is 1160-1180 ℃, the idle step length is 3.5-4.5 meters; if the highest tapping temperature is 1180-1200 ℃, the idle step length is 5-6 meters; and if the highest tapping temperature is between 1200 and 1220 ℃, the idle step length is 7 to 8 meters.
Therefore, in practical application, the step length can be quickly calculated only by acquiring the highest tapping temperature of the first slabs with the set number at the tail of the first slab sequence.
The implementation of the above scheme is illustrated here.
After the first slab sequence has been heated normally, a second slab 30 having a thickness specification of 110mm is added to the furnace.
And (3) charging steel into the first 50 first slabs in the first slab sequence by two furnaces at the beginning, wherein the steel charging interval is 300mm, the length specification of the second slab is 10500mm, the middle positioning is adopted, and the head and the tail of the slab are suspended with water beams 350 mm.
In the same heat, the highest tapping temperature of the 15 first slabs at the tail of the last roll period is 1175 ℃, so that the distance between the foremost end of the second slab sequence and the slabs at the tail of the last roll period is 4 m.
Closing all the burners of the preheating section after the second slab enters the furnace; when the first plate blank leaves the first heating section, all the first adding burners are closed; and after the first slab leaves the second heating section, the second adding burner nozzles are all closed. Heating the subsequent thin-specification plate blanks by using the residual heat of the flue gas, monitoring the temperature of the second plate blank in the heating process, wherein the tapping temperature is 1110 ℃, the end temperature of the second heating section is 980 ℃, the end temperature of the first heating section is 830 ℃, and the total heating time is 120 min. The second plate blank has good temperature state after being discharged from the furnace, good blank shape and no deformation, and meets the rolling requirement.
Here, the present embodiment also provides a practical application case of the above scheme to illustrate the practical benefit obtained by the present embodiment.
Application case
As a plurality of steel mills of first steel can generate a large amount of waste billets with the thickness of 110 mm-170 mm after accidents occur. In order to improve the utilization efficiency of the waste billets, the thin billets are planned to be rolled into auction materials in a centralized way on a hot rolling production line, and the secondary utilization of the waste billets is realized. The auction material has lower requirements on surface quality and performance, so the risk is lower in the rolling process, and the difficulty is mainly concentrated in the heating link.
The design size of the thickness of the slab of the hot rolling heating furnace is generally 220 mm-240 mm, and the burner power and the furnace body structure are designed according to the specification. When a thin blank with the thickness of 110 mm-170 mm and a normal blank are mixed and heated, the temperature of a hearth required by the normal blank is far higher than that of the thin blank, so that the temperature of the adjacent thin blank rises quickly and exceeds the required temperature range. If the thin ruler blank is heated independently, the steel needs to be installed after the blank with normal specification in the furnace is emptied, which has great influence on the production rhythm and causes the problems of energy waste, yield reduction and the like.
In the production of a certain steel factory of first steel, the scheme is applied, the mixed heating of the thin slab and the thick slab in the same heating furnace is realized, the heating furnaces required in the hot rolling process are reduced, and the production cost of the hot rolling process is reduced. At present, about 1000 tons of slabs with the thickness of 110 mm-160 mm are rolled by first steel per month, the price of waste slabs is about 2000 yuan/ton, the price of usable materials after hot rolling is 3700 yuan/ton, the processing cost is about 220 yuan, and the income is increased by 1776 ten thousand yuan every year. Meanwhile, the scheme can expand the specification of the heating furnace for producing the plate blank, reduce the problems of energy waste, environmental pollution and the like caused by secondary smelting of the waste blank, reduce carbon emission and respond to the national environmental protection requirement.
Based on the same inventive concept as the method, an embodiment of the present invention further provides a slab heating control apparatus, as shown in fig. 3, which is a schematic structural diagram of the apparatus embodiment, and the apparatus includes:
the first control module 41 is used for controlling the heating furnace to heat the first slab sequence in the first rolling period;
a second control module 42 for controlling the entry of a second slab sequence into the furnace at the beginning of the second roll session; wherein the thickness of a second slab in the second slab sequence is less than the thickness of a first slab in the first slab sequence; when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roll period;
and the third control module 43 is used for sequentially closing the burners of the heating section corresponding to the tail position of the first slab sequence in the heating furnace, and heating the second slab sequence by using the residual heat of the flue gas in the heating furnace.
In a possible embodiment, the apparatus further comprises:
the first determining module is used for determining the production speed of the heating furnace according to the preset hot rolling production speed before the heating furnace is controlled to heat the first slab sequence;
and the second determining module is used for determining the steel charging interval of the first slab sequence and the steel charging interval of the second slab sequence according to the production speed of the heating furnace.
In a possible embodiment, the thickness of the first slab is between 200 and 240 mm; the thickness of the second slab is 100 mm to 160 mm.
In a possible embodiment, the apparatus further comprises:
the third determining module is used for determining the step length according to the tapping temperature of the first slab sequence before the heating furnace is controlled to heat the first slab sequence;
if the highest tapping temperature of the first slabs with the set number at the tail of the first slab sequence is not more than 1160 ℃, the step length is 1.5-2.5 m; if the highest tapping temperature is 1160-1180 ℃, the idle step length is 3.5-4.5 meters; if the highest tapping temperature is 1180-1200 ℃, the idle step length is 5-6 meters; and if the highest tapping temperature is between 1200 and 1220 ℃, the idle step length is 7 to 8 meters.
In a possible embodiment, the steel-loading pitch of the second slab sequence ranges from 200mm to 300mm, so as to control the on-furnace time of the second slab in the heating furnace between 70 minutes and 150 minutes.
In a possible embodiment, the difference between the length of the first slab and the length of the water beam in the furnace is not greater than 1.6 m, and the difference between the length of the second slab and the length of the water beam in the furnace is not greater than 1.6 m.
Based on the same inventive concept as the previous embodiment, an embodiment of the present invention further provides a slab heating control apparatus, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the steps of any one of the slab heating control methods.
Based on the same inventive concept as in the previous embodiments, embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of any of the slab heating control methods described above.
The technical scheme provided by the embodiment of the invention at least has the following technical effects or advantages:
according to the embodiment of the invention, the heating furnace is controlled to heat the thicker first slab sequence in the first roll period according to a conventional mode, then when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, the thinner second slab sequence is heated, and simultaneously along with the movement of the second slab sequence in the heating furnace, the burners of the heating section corresponding to the foremost position of the first slab sequence in the heating furnace are sequentially closed, and the second slab sequence is heated by utilizing the residual temperature of the flue gas in the heating furnace, so that the mixed heating of the thin slab and the thick slab in the same heating furnace is realized, the heating furnace required in the hot rolling process is reduced, and the production cost of the hot rolling process is reduced.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for controlling heating of a sheet blank, the method comprising:
in the first rolling period, controlling a heating furnace to heat the first slab sequence;
controlling a second slab sequence to enter an inlet of the heating furnace at the beginning of the second roll period; wherein the thickness of a second slab in the second slab sequence is less than the thickness of a first slab in the first slab sequence; when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roll period;
and closing burners of the heating section corresponding to the tail position of the first slab sequence in the heating furnace in sequence, and heating the second slab sequence by using the residual heat of the flue gas in the heating furnace.
2. Slab heating control method according to claim 1, characterized in that before controlling the furnace to heat the first sequence of slabs, the method further comprises:
determining the production speed of the heating furnace according to a preset hot rolling production speed;
and determining the steel charging interval of the first slab sequence and the steel charging interval of the second slab sequence according to the production speed of the heating furnace.
3. The slab heating control method according to claim 2, wherein the thickness of the first slab is 200 to 240 mm; the thickness of the second slab is 100 mm to 160 mm.
4. A slab heating control method as claimed in claim 3, wherein before the control furnace heats the first slab sequence, the method further comprises:
determining the idle step length according to the tapping temperature of the first slab sequence;
if the highest tapping temperature of the first slabs with the set number at the tail of the first slab sequence is not more than 1160 ℃, the step length is 1.5-2.5 m; if the highest tapping temperature is 1160-1180 ℃, the idle step length is 3.5-4.5 meters; if the highest tapping temperature is 1180-1200 ℃, the idle step length is 5-6 meters; and if the highest tapping temperature is between 1200 and 1220 ℃, the idle step length is 7 to 8 meters.
5. Slab heating control method according to claim 2, characterized in that the steel charging pitch of the second slab sequence ranges from 200mm to 300mm to control the in-furnace time of the second slab in the furnace between 70 and 150 minutes.
6. A slab heating control method as claimed in any one of claims 1 to 5, wherein the first slab has an overhang length of not more than 0.8 m on a water beam in the furnace, and the second slab has an overhang length of not more than 0.8 m on the water beam in the furnace.
7. A slab heating control apparatus, characterized in that the apparatus comprises:
the first control module is used for controlling the heating furnace to heat the first slab sequence in the first rolling period;
the second control module is used for controlling a second plate blank sequence to enter the inlet of the heating furnace when the second roll period starts; wherein the thickness of a second slab in the second slab sequence is less than the thickness of a first slab in the first slab sequence; when the distance from the tail of the first slab sequence to the inlet of the heating furnace exceeds the idle step length, controlling the heating furnace to heat in a second roll period;
and the third control module is used for sequentially closing the burners of the heating section corresponding to the tail position of the first slab sequence in the heating furnace and heating the second slab sequence by using the residual heat of the flue gas in the heating furnace.
8. The slab heating control device of claim 7, further comprising:
the first determining module is used for determining the production speed of the heating furnace according to the preset hot rolling production speed before the heating furnace is controlled to heat the first slab sequence;
and the second determining module is used for determining the steel charging interval of the first slab sequence and the steel charging interval of the second slab sequence according to the production speed of the heating furnace.
9. A slab heating control apparatus, characterized by comprising:
a memory for storing a computer program;
a processor for executing the computer program to carry out the steps of the method of any one of claims 1 to 6.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, is adapted to carry out the steps of the method of any one of claims 1 to 6.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115029539A (en) * | 2022-05-11 | 2022-09-09 | 首钢京唐钢铁联合有限责任公司 | Method for heating thin slab by thick slab heating furnace |
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| US4087238A (en) * | 1976-09-13 | 1978-05-02 | United States Steel Corporation | Method for enhancing the heating efficiency of continuous slab reheating furnaces |
| US4257767A (en) * | 1979-04-30 | 1981-03-24 | General Electric Company | Furnace temperature control |
| CN201083461Y (en) * | 2007-07-19 | 2008-07-09 | 宝山钢铁股份有限公司 | Heat accumulation type bar plate heating stove |
| CN111020173A (en) * | 2019-11-20 | 2020-04-17 | 唐山钢铁集团高强汽车板有限公司 | Method for controlling heating output of continuous annealing furnace according to thickness specification |
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2021
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| US4087238A (en) * | 1976-09-13 | 1978-05-02 | United States Steel Corporation | Method for enhancing the heating efficiency of continuous slab reheating furnaces |
| US4257767A (en) * | 1979-04-30 | 1981-03-24 | General Electric Company | Furnace temperature control |
| CN201083461Y (en) * | 2007-07-19 | 2008-07-09 | 宝山钢铁股份有限公司 | Heat accumulation type bar plate heating stove |
| CN111020173A (en) * | 2019-11-20 | 2020-04-17 | 唐山钢铁集团高强汽车板有限公司 | Method for controlling heating output of continuous annealing furnace according to thickness specification |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115029539A (en) * | 2022-05-11 | 2022-09-09 | 首钢京唐钢铁联合有限责任公司 | Method for heating thin slab by thick slab heating furnace |
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